Searching after a movie!!

Hello i am searching after a movie it quaite old and i dont remember the name but i remember a litle from the movie.
its starts when a man rowts somthing about pain feel no pain ore somthing like that with a knife on his litel sons back then he gows to prison. his son grows up and hi cant feel any pain. in the end hi has to fight his father but hi dot know that hi is his father and his father dont know that hi is his son.

i will be very happy if sombody can help i have been searching for this movie very long time now.

THANKS